trace_buf.c

ncurses 库 可能有用酒用 没用就算了 我觉得还可以用

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/****************************************************************************
 *  Author: Thomas E. Dickey <[e-mail]> 1997                        *
 ****************************************************************************/
/*
 *	trace_buf.c - Tracing/Debugging buffers (attributes)
 */

#include <curses.priv.h>

MODULE_ID("$Id: trace_buf.c,v 1.12 2003/03/15 21:21:36 tom Exp $")

typedef struct {
    char *text;
    size_t size;
} LIST;

static char *
_nc_trace_alloc(int bufnum, size_t want)
{
    char *result = 0;
    static LIST *list;
    static size_t have;

    if (bufnum >= 0) {
	if ((size_t) (bufnum + 1) > have) {
	    size_t need = (bufnum + 1) * 2;
	    if ((list = typeRealloc(LIST, need, list)) == 0)
		return (0);
	    while (need > have)
		list[have++].text = 0;
	}

	if (list[bufnum].text == 0
	    || want > list[bufnum].size) {
	    if ((list[bufnum].text = typeRealloc(char, want, list[bufnum].text))
		!= 0)
		  list[bufnum].size = want;
	}

	result = list[bufnum].text;
    }
#if NO_LEAKS
    else {
	if (have) {
	    while (have--) {
		if (list[have].text != 0)
		    free(list[have].text);
	    }
	    free(list);
	}
    }
#endif
    return result;
}

/*
 * (re)Allocate a buffer big enough for the caller's wants.
 */
NCURSES_EXPORT(char *)
_nc_trace_buf(int bufnum, size_t want)
{
    char *result = _nc_trace_alloc(bufnum, want);
    if (result != 0)
	*result = '\0';
    return result;
}

/*
 * Append a new string to an existing buffer.
 */
NCURSES_EXPORT(char *)
_nc_trace_bufcat(int bufnum, const char *value)
{
    char *buffer = _nc_trace_alloc(bufnum, 0);
    size_t have = strlen(buffer);

    buffer = _nc_trace_alloc(bufnum, 1 + have + strlen(value));
    (void) strcpy(buffer + have, value);

    return buffer;
}